These sources discuss electromagnetic induction, defining it as the phenomenon where a changing magnetic field produces an electric current or voltage in a conductor. They highlight the independent discovery by Michael Faraday and Joseph Henry in 1831, with Faraday often receiving more recognition due to earlier publication. The articles explain key concepts like magnetic flux, which represents the amount of magnetic field lines passing through an area, and the Law of Faraday, which quantifies the induced electromotive force based on the rate of change of magnetic flux. The Law of Lenz is also mentioned for describing the direction of the induced current, which opposes the change in flux. Various applications of electromagnetic induction are presented, including generators, transformers, and electric motors. Several sources also include exercises and practice questions related to these concepts and their formulas.